Firewalls
Prevent intruders by securing Internet connections
- From making unauthorized access and denial of service attacks to your network
Could be a router, gateway, or special purpose computer
- Examines packets flowing into and out of the organization’s network
- Restricts access to that network
- Placed on every connection that network has to Internet
Main types of firewalls
- Packet level firewalls (a.k.a., packet filters)
- Application-level firewalls (a.k.a., application gateway)